Preheat oven to 375 degrees F. Line a baking sheet with parchment paper; set aside.

Cut each zucchini in half horizontally, then carefully scoop out the center of the zucchini, reserving for another use, leaving about 1/2-inch of zucchini on the skin.

Heat olive oil in a saucepan over medium high heat. Add ground turkey, oregano, basil, salt and pepper, to taste. Cook until browned, about 3-5 minutes, making sure to crumble the turkey as it cooks; drain excess fat. Stir in marinara sauce until heated through, about 1-2 minutes.

Add ground turkey mixture to each zucchini and sprinkle with mozzarella. Place into oven and bake until the zucchini is tender and the cheese has melted, about 10-12 minutes.